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<p>&#x2003;&#x2003;&#x524D;&#x9762;&#x4ECB;&#x7ECD;&#x7684;&#x6570;&#x7EC4;&#x53EA;&#x6709;&#x4E00;&#x4E2A;&#x7EF4;&#x5EA6;&#xFF0C;&#x79F0;&#x4E3A;&#x4E00;&#x7EF4;&#x6570;&#x7EC4;&#xFF0C;&#x5176;&#x6570;&#x7EC4;&#x5143;&#x7D20;&#x4E5F;&#x53EA;&#x6709;&#x4E00;&#x4E2A;&#x4E0B;&#x6807;&#x53D8;&#x91CF;&#x3002;&#x5728;&#x5B9E;&#x9645;&#x95EE;&#x9898;&#x4E2D;&#x6709;&#x5F88;&#x591A;&#x60C5;&#x51B5;&#x662F;&#x4E8C;&#x7EF4;&#x6216;&#x591A;&#x7EF4;&#x7684;&#xFF0C;Java&#x8BED;&#x8A00;&#x5141;&#x8BB8;&#x6784;&#x9020;&#x591A;&#x7EF4;&#x6570;&#x7EC4;&#x5B58;&#x50A8;&#x591A;&#x7EF4;&#x6570;&#x636E;&#x3002;&#x591A;&#x7EF4;&#x6570;&#x7EC4;&#x7684;&#x6570;&#x7EC4;&#x5143;&#x7D20;&#x6709;&#x591A;&#x4E2A;&#x4E0B;&#x6807;&#xFF0C;&#x4EE5;&#x6807;&#x8BC6;&#x5B83;&#x5728;&#x6570;&#x7EC4;&#x4E2D;&#x7684;&#x4F4D;&#x7F6E;&#x3002;&#x7F16;&#x7A0B;&#x4E2D;&#xFF0C;&#x7ECF;&#x5E38;&#x4F1A;&#x7528;&#x5230;&#x4E8C;&#x7EF4;&#x6570;&#x7EC4;&#xFF0C;&#x66F4;&#x9AD8;&#x7EF4;&#x5EA6;&#x7684;&#x6570;&#x7EC4;&#x5728;&#x5B9E;&#x9645;&#x7F16;&#x7A0B;&#x4E2D;&#x5F88;&#x5C11;&#x4F7F;&#x7528;&#xFF0C;&#x6240;&#x4EE5;&#x8FD9;&#x91CC;&#x4EC5;&#x4ECB;&#x7ECD;&#x4E8C;&#x7EF4;&#x6570;&#x7EC4;&#x3002;</p>
<h3 id="431--&#x4E8C;&#x7EF4;&#x6570;&#x7EC4;&#x7B80;&#x4ECB;">4.3.1  &#x4E8C;&#x7EF4;&#x6570;&#x7EC4;&#x7B80;&#x4ECB;</h3>
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<pre><code>&#x6570;&#x636E;&#x7C7B;&#x578B;[][]  &#x6570;&#x7EC4;&#x540D;;&#x6216;  &#x6570;&#x636E;&#x7C7B;&#x578B; &#x6570;&#x7EC4;&#x540D;[][];

&#x6570;&#x7EC4;&#x540D; = new &#x6570;&#x636E;&#x7C7B;&#x578B;[&#x7B2C;&#x4E00;&#x7EF4;&#x957F;&#x5EA6;] [&#x7B2C;&#x4E8C;&#x7EF4;&#x957F;&#x5EA6;];
</code></pre><p>&#x2003;&#x2003;&#x5728;&#x521B;&#x5EFA;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x53EF;&#x4EE5;&#x540C;&#x65F6;&#x8BBE;&#x7F6E;&#x7B2C;&#x4E00;&#x7EF4;&#x957F;&#x5EA6;&#x548C;&#x7B2C;&#x4E8C;&#x7EF4;&#x957F;&#x5EA6;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x53EA;&#x8BBE;&#x7F6E;&#x7B2C;&#x4E00;&#x7EF4;&#x957F;&#x5EA6;&#xFF0C;&#x4F46;&#x4E0D;&#x53EF;&#x4EE5;&#x53EA;&#x8BBE;&#x7F6E;&#x7B2C;&#x4E8C;&#x7EF4;&#x957F;&#x5EA6;&#x3002;&#x4F8B;&#x5982;&#xFF1A;</p>
<pre><code>int[][] arr = new int[3][4];
</code></pre><p>&#x2003;&#x2003;&#x5728;&#x76F4;&#x89C2;&#x4E0A;&#x770B;&#xFF0C;&#x4E0A;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x5C31;&#x662F;&#x5B9A;&#x4E49;&#x4E86;&#x4E00;&#x4E2A;3&#x884C;4&#x5217;&#x7684;&#x4E8C;&#x7EF4;&#x6570;&#x7EC4;&#xFF0C;&#x6570;&#x7EC4;&#x540D;&#x4E3A;arr&#x3002;&#x8BE5;&#x6570;&#x7EC4;&#x7684;&#x4E0B;&#x6807;&#x53D8;&#x91CF;&#x5171;&#x6709;12&#xFF08;3&#xD7;4&#xFF09;&#x4E2A;&#xFF0C;&#x5373;&#xFF1A;</p>
<pre><code>arr [0][0], arr [0][1], arr [0][2], arr [0][3]

arr [1][0], arr [1][1], arr [1][2], arr [1][3]

arr [2][0], arr [2][1], arr [2][2], arr [2][3]
</code></pre><p>&#x2003;&#x2003;&#x4E8C;&#x7EF4;&#x6570;&#x7EC4;&#x672C;&#x8D28;&#x662F;&#x4E00;&#x7EF4;&#x6570;&#x7EC4;&#xFF0C;&#x5176;&#x4E2D;&#x8FD9;&#x4E2A;&#x4E00;&#x7EF4;&#x6570;&#x7EC4;&#x7684;&#x6BCF;&#x4E2A;&#x5143;&#x7D20;&#x90FD;&#x662F;&#x5F15;&#x7528;&#x7C7B;&#x578B;&#xFF0C;&#x5206;&#x522B;&#x6307;&#x5411;&#x4E0D;&#x540C;&#x7684;&#x4E00;&#x7EF4;&#x6570;&#x7EC4;&#xFF0C;&#x5176;&#x5185;&#x5B58;&#x7ED3;&#x6784;&#x548C;&#x4E4B;&#x524D;&#x4ECB;&#x7ECD;&#x7684;String&#x578B;&#x4E00;&#x7EF4;&#x6570;&#x7EC4;&#x7C7B;&#x4F3C;&#x3002;</p>
<p>&#x2003;&#x2003;&#x4E8C;&#x7EF4;&#x6570;&#x7EC4;&#x7684;&#x8D4B;&#x503C;&#x548C;&#x4F7F;&#x7528;&#x4E0E;&#x4E00;&#x7EF4;&#x6570;&#x7EC4;&#x7C7B;&#x4F3C;&#xFF0C;&#x90FD;&#x662F;&#x901A;&#x8FC7;&#x4E0B;&#x6807;&#x8BBF;&#x95EE;&#x6570;&#x7EC4;&#x5143;&#x7D20;&#xFF0C;&#x4E0D;&#x540C;&#x7684;&#x662F;&#x4E00;&#x7EF4;&#x6570;&#x7EC4;&#x53EA;&#x6709;&#x4E00;&#x4E2A;&#x4E0B;&#x6807;&#xFF0C;&#x800C;&#x4E8C;&#x7EF4;&#x6570;&#x7EC4;&#x6709;&#x4E24;&#x4E2A;&#x4E0B;&#x6807;&#xFF0C;&#x5206;&#x522B;&#x8868;&#x793A;&#x8BE5;&#x5143;&#x7D20;&#x6240;&#x5728;&#x6570;&#x7EC4;&#x7684;&#x884C;&#x6570;&#x548C;&#x5217;&#x6570;&#x3002;&#x4F8B;&#x5982;arr[0][3]&#xFF0C;&#x5176;&#x8868;&#x793A;&#x7684;&#x662F;&#x6570;&#x7EC4;arr&#x4E2D;&#x7B2C;1&#x884C;&#x7B2C;4&#x5217;&#x7684;&#x5143;&#x7D20;&#x3002;</p>
<p>&#x2003;&#x2003;&#x5728;&#x58F0;&#x660E;&#x5E76;&#x521B;&#x5EFA;&#x6570;&#x7EC4;&#xFF08;int[][] arr = new int[3][4];&#xFF09;&#x4E4B;&#x540E;&#xFF0C;&#x53EF;&#x4F7F;&#x7528;&#x7684;&#x6570;&#x7EC4;&#x4E0B;&#x6807;&#x8303;&#x56F4;&#x4E3A;&#xFF1A;arr[0][0]~arr[2][3]&#xFF0C;&#x8FD9;&#x4E00;&#x70B9;&#x548C;&#x4E00;&#x7EF4;&#x6570;&#x7EC4;&#x7C7B;&#x4F3C;&#xFF0C;&#x9700;&#x8981;&#x6CE8;&#x610F;&#x6570;&#x7EC4;&#x4E0B;&#x6807;&#x8D8A;&#x754C;&#x7684;&#x95EE;&#x9898;&#x3002;</p>
<p>&#x2003;&#x2003;&#x540C;&#x4E00;&#x7EF4;&#x6570;&#x7EC4;&#x4E00;&#x6837;&#xFF0C;&#x4E8C;&#x7EF4;&#x6570;&#x7EC4;&#x5728;&#x521B;&#x5EFA;&#x7684;&#x65F6;&#x5019;&#x4E5F;&#x53EF;&#x4EE5;&#x521D;&#x59CB;&#x5316;&#xFF0C;&#x4F8B;&#x5982;&#xFF1A;</p>
<pre><code>int[][] arr1= \{\{2,3},{1,5},{3,9\}\};//&#x521D;&#x59CB;&#x5316;&#x4E00;&#x4E2A;3&#x884C;2&#x5217;&#x7684;&#x6574;&#x578B;&#x4E8C;&#x7EF4;&#x6570;&#x7EC4;

int[][] arr2= \{\{1,2,3},{1,5},{3,9\}\};//&#x521D;&#x59CB;&#x5316;&#x4E00;&#x4E2A;3&#x884C;&#x7684;&#x6574;&#x578B;&#x4E8C;&#x7EF4;&#x6570;&#x7EC4;
</code></pre><p>&#x2003;&#x2003;&#x5176;&#x4E2D;&#x6570;&#x7EC4;arr2&#x7B2C;&#x4E00;&#x884C;&#x6709;3&#x4E2A;&#x5143;&#x7D20;&#xFF0C;&#x7B2C;&#x4E8C;&#x548C;&#x7B2C;&#x4E09;&#x884C;&#x6709;2&#x4E2A;&#x5143;&#x7D20;&#xFF0C;&#x5BF9;&#x4E8E;&#x8FD9;&#x7C7B;&#x6BCF;&#x884C;&#x5143;&#x7D20;&#x6570;&#x4E0D;&#x540C;&#x7684;&#x4E8C;&#x7EF4;&#x6570;&#x7EC4;&#xFF0C;&#x5728;&#x4F7F;&#x7528;&#x65F6;&#x5C24;&#x5176;&#x9700;&#x8981;&#x6CE8;&#x610F;&#x6570;&#x7EC4;&#x4E0B;&#x6807;&#x8D8A;&#x754C;&#x7684;&#x95EE;&#x9898;&#x3002;</p>
<h3 id="432--&#x4E8C;&#x7EF4;&#x6570;&#x7EC4;&#x7684;&#x4F7F;&#x7528;">4.3.2  &#x4E8C;&#x7EF4;&#x6570;&#x7EC4;&#x7684;&#x4F7F;&#x7528;</h3>
<p>&#x2003;&#x2003;&#x63A5;&#x4E0B;&#x6765;&#x5B8C;&#x6210;&#x4E00;&#x4E2A;&#x6848;&#x4F8B;&#xFF1A;&#x67D0;&#x5B66;&#x4E60;&#x5C0F;&#x7EC4;&#x6709;4&#x4E2A;&#x5B66;&#x751F;&#xFF0C;&#x6BCF;&#x4E2A;&#x5B66;&#x751F;&#x6709;3&#x95E8;&#x8BFE;&#x7684;&#x8003;&#x8BD5;&#x6210;&#x7EE9;&#xFF0C;&#x5982;&#x8868;4.1&#x6240;&#x793A;&#x3002;&#x6C42;&#x5404;&#x79D1;&#x76EE;&#x7684;&#x5E73;&#x5747;&#x6210;&#x7EE9;&#x548C;&#x603B;&#x5E73;&#x5747;&#x6210;&#x7EE9;&#x3002;</p>
<p><center>&#x8868;4.1  &#x5B66;&#x751F;&#x6210;&#x7EE9;&#x8868;</center><br>| &#x79D1;&#x76EE;\&#x59D3;&#x540D; | &#x738B;&#x4E91; | &#x5218;&#x9759;&#x6D9B; | &#x5357;&#x5929;&#x534E; | &#x96F7;&#x9759; |
| --------- | ---- | ------ | ------ | ---- |
| Java&#x57FA;&#x7840;  | 77   | 65     | 91     | 84   |
| &#x524D;&#x7AEF;&#x6280;&#x672F;  | 56   | 71     | 88     | 79   |
| &#x540E;&#x7AEF;&#x6280;&#x672F;  | 80   | 81     | 85     | 66   |</p>
<p>&#x2003;&#x2003;&#x7A0B;&#x5E8F;&#x8FD0;&#x884C;&#x7ED3;&#x679C;&#x5982;&#x56FE;4.12&#x6240;&#x793A;&#xFF0C;&#x5177;&#x4F53;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#x3002;</p>
<p><center><img src="https://labfile.oss.aliyuncs.com/library/textbook-java1/img/d4z/tu4.12.png"></center></p>
<p><center> &#x56FE;4.12  &#x4E8C;&#x7EF4;&#x6570;&#x7EC4;&#x7684;&#x5E94;&#x7528; </center>  </p>
<pre><code>import java.util.Scanner;

class Test2Array 

{

    public static void main(String[] args) 

    {

        int i = 0;

        int j = 0;

        String[] course = {&quot;Java&#x57FA;&#x7840;&quot;,&quot;&#x524D;&#x7AEF;&#x6280;&#x672F;&quot;,&quot;&#x540E;&#x7AEF;&#x6280;&#x672F;&quot;};

        String[] name = {&quot;&#x738B;&#x4E91;&quot;,&quot;&#x5218;&#x9759;&#x6D9B;&quot;,&quot;&#x5357;&#x5929;&#x534E;&quot;,&quot;&#x96F7;&#x9759;&quot;};

        int[][] stuScore = new int[3][4];                                          //&#x5B58;&#x653E;&#x6240;&#x6709;&#x5B66;&#x751F;&#x5404;&#x79D1;&#x6210;&#x7EE9;

        int[] singleSum = new int[]{0,0,0};                                              //&#x5B58;&#x653E;&#x5404;&#x79D1;&#x6210;&#x7EE9;&#x7684;&#x548C;

        int allScore = 0;                                                                   //&#x5B58;&#x653E;&#x603B;&#x6210;&#x7EE9;

        Scanner input = new Scanner(System.in);



        //&#x8F93;&#x5165;&#x6210;&#x7EE9;&#xFF0C;&#x5BF9;&#x5355;&#x79D1;&#x6210;&#x7EE9;&#x7D2F;&#x52A0;&#xFF0C;&#x5BF9;&#x603B;&#x6210;&#x7EE9;&#x7D2F;&#x52A0;

        for(i = 0;i &lt; 3; i++)

        {

            for(j = 0;j &lt; 4;j++){ 

                System.out.print(&quot;&#x8BF7;&#x8F93;&#x5165;&#x79D1;&#x76EE;&#xFF1A;&quot; + course[i] + &quot; &#x5B66;&#x751F;&#xFF1A;&quot; + name[j] + &quot; &#x7684;&#x6210;&#x7EE9;&#xFF1A;&quot;);

                stuScore[i][j] = input.nextInt();                         //&#x8BFB;&#x53D6;&#x5B66;&#x751F;&#x6210;&#x7EE9;

                singleSum[i] = singleSum[i] + stuScore[i][j];  //&#x5355;&#x79D1;&#x6210;&#x7EE9;&#x7D2F;&#x52A0;

            }                          

            allScore = allScore + singleSum[i];                                     //&#x603B;&#x6210;&#x7EE9;&#x7D2F;&#x52A0;

        }



        for(i = 0;i &lt; 3; i++)

        {

            System.out.println(&quot;&#x79D1;&#x76EE;&#xFF1A;&quot; + course[i] + &quot;&#x7684;&#x5E73;&#x5747;&#x6210;&#x7EE9;&#xFF1A;&quot; + singleSum[i] / 4.0);

        }

        System.out.println(&quot;&#x603B;&#x5E73;&#x5747;&#x6210;&#x7EE9;:&quot; + allScore / 12.0);

    }

}
</code></pre>
                                
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